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LIN D O C #: 1640
LXM1640-01
DIRECT D R I V E Q U A D LAMP CCFL INVERTER M O D U L E
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DESCRIPTION
The Quad Output Module Ideal for Desktop and Industrial Applications. The LXM1640 Direct DriveTM Cold Cathode Fluorescent Lamp (CCFL) Inverter is a single module designed to drive four lamps and is targeted for use with desktop Liquid Crystal Display (LCD) and industrial LCD panels typically ranging in size from 14-inches to 21-inches. This four output inverter is the ideal solution to power virtually any four lamp application. Direct Drive Technology. The module design is based on a new Direct Drive topology, which provides a number of cost and per for mance advantages. The LXM1640-01 Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a substantial reduction in module size. Fixed-Frequency Operation. Other benefits of this new topology are fixed-frequency operation and secondary-side strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. Fail-safe Feature For Multiple Lamp Applications. Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Quad Module Uses Standard Power Supply. The LXM1640 module uses a standard 12V input supply. It also ensures nominal power consumption with 4 lamps requiring only 16 watts. Lamp current is fully regulated with respect to input voltage and output impedance variations. Dimming Features. The LXM1640 modules are equipped with a dimming input that permits brightness control from an external potentiometer or DC voltage. In addition, the sleep input reduces module power to a few microwatts in shut down mode. All LXM1640 modules feature both output open and short-circuit protection. The Most Efficient and Cost-effective Backlight Inverter for Desktop/Industrial Applications. Linfinity's proprietary Direct Drive architecture is the highest efficiency, small form factor solution for all multiple lamp applications. The LXM1640 is fully customizable (electronically and mechanically) to specific customer requirements.
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K E Y F E AT U R E S
Drive Four Lamps With One Module Small, Compact Size High Efficiency Multiple Output Connectors Provide Easy LCD Connections Low EMI And Noise Low Power Sleep Mode Output Short And Open Circuit Protection 3:1 Dimming Control Adjustable Lamp Current Up To 6.0mA Per Lamp Long Lamp Life With Soft-Start And Accurate Lamp Current Regulation
A P P L I C AT I O N S
s Desktop LCD Monitors And Panels s Industrial LCD Panels s Hi-Brite Displays
BENEFITS
s Cool Operation s Smooth, Easy-To-Use Brightness Control s Single 12 Volt Supply
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
LXM1640 "U N I V E R S A L " M O D U L E CONNECTION OPTIONS
Quad Connector Configuration
CN4 CN7
Dual Connector Configuration
CN2
CN5
LXM1640-01
CN1
CCFL Lamps
LXM1640-01
CN1
CN6
CN3
CCFL Lamps
CN6
CN5 CN4
CN3
CN7
Desktop Display
CN2
Desktop Display
M O D U L E O R D E R I N F O R M AT I O N
LXM1640-01
Copyright (c) 1998 Rev. 0.4 5/98
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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PRODUCT DATABOOK 1996/1997
LXM1640-01
DIRECT D R I V E QUAD LAMP CCFL INVERTER M O D U L E
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(Note 1)
A B S O L U T E M A X I M U M R AT I N G S
Input Supply Voltage (VIN)....................................................................................................................................................... -0.3V to 16V Output Voltage, no load .............................................................................................................................. Internally Limited to 1800VRMS Output Current (per Lamp) ........................................................................................................................ 10.0mARMS (Internally Limited) Output Power (per Lamp) .................................................................................................................................................................... 6.0W Input Signal Voltage, (SLEEP and BRITE Inputs) ..................................................................................................................... -0.3V to VIN Ambient Operating Temperature, zero airflow ........................................................................................................................ 0C to 40C Storage Temperature Range ................................................................................................................................................... -40C to 85C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S (R.C.) This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance will be obtained if the module is operated under the condition listed in the 'R.C.' column. Min. and Max. columns indicate values beyond which the inverter, although operational, will not function optimally. Parameter
Input Supply Voltage Range (Functional) Output Power (per Lamp) Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness - per Lamp) Operating Ambient Temperature Range
Symbol
VIN PO VBRT ADJ VLAMP IOLAMP TA
Recommended Operating Conditions Min. R.C. Max.
10.8 0.0 300 0 12 4 675 6.0 13.2 5 5.0 800 40
Units
V W V VRMS mA RMS C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1640.
Parameter Output Pin Characteristics
Full Bright Lamp Current (per Lamp) Minimum Lamp Current (per Lamp) (Note 2) Lamp Start Voltage Operating Frequency
Symbol
Test Conditions
LXM1640-01 Min. Typ. Max.
5.4 6.0 0.5 6.6
Units
IL (MAX) I L (MIN) V LS fO IBRT VC VC VSLEEP (HI) VSLEEP (LO) ISLEEP IIN (MIN)
VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC, SLEEP = HIGH, V IN = 12V DC 0C < TA < 40C, VIN 10.8V DC VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC IO (LAMP) = 100% IO (LAMP) = Minimum
mA RMS mA RMS VRMS KHz ADC VDC VDC VDC VDC ADC ADC
1500 52 27
57 30 5.0 0
1800 62 33
BRITE Input
Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current
SLEEP Input
RUN Mode SLEEP Mode Input Current 2.2 -0.3 90 0 VIN 0.8 150 500
SLEEP = 5.0V VIN = 12VDC , SLEEP = 0VDC
110 10
Power Characteristics
Sleep Current Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
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Copyright (c) 1998 Rev. 0.4 5/98
PRODUCT DATABOOK 1996/1997
LXM1640-01
DIRECT D R I V E Q U A D LAMP CCFL INVERTER M O D U L E
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FUNCTIONAL PIN DESCRIPTION
Conn. CN1
CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8
Pin
Description
VIN GND SLEEP BRITE N.C. N.C.
Input Power Supply. (10.8V VIN 13.2V) Power Supply Return. ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) Brightness Control (-0.3V to 5.0VDC ). No Connect. No Connect. 5.0VDC gives maximum lamp current.
CN2 and CN3: Refer to Figure 1
PHYSICAL DIMENSIONS
LXM1640-01
All dimensions are in inches (mm)
6.89 (175) 0.016 (4) CN3 0.94 (24) CN7 0.32 (8.25) CN6 CN1 6.73 (171)
O 0.118 (3.0) Mtg. Hole, 2 Places
0.016 (4) CN2 0.33 (8.5) CN5 CN4
0.06 (1.52) 0.46 (11.8)
Copyright (c) 1998 Rev. 0.4 5/98
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PRODUCT DATABOOK 1996/1997
LXM1640-01
DIRECT D R I V E QUAD LAMP CCFL INVERTER M O D U L E
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C O N N E C T O R S C H E M AT I C
CN4
3 2 1 2
CN5
1 8
CN1
1 2
CN6
1 3
CN7
2 1
N.C.
VHI1
4
VHI2
VHI3
VHI4
N.C.
1
2
3
CN2
Inverter Output 1
Inverter Output 2
Inverter Output 3
Inverter Output 4
1
2
3
4
CN3
FIGURE 1 -- LXM1640-01 Connector Schematic
Connectors: CN1 = MOLEX 53261-0890 CN2, CN3 = JST SM04(4.0)B-BHS-1-TB CN4, CN7 = JST SM03(4.0)B-BHS-1-TB CN5, CN6 = JST SM02(8.0)B-BHS-1-TB
Connection Rules
Mates With: Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
JST BHR-04VS-1 JST BHR-03VS-1 JST BHR-03VS-1
1. Always install four (4) lamps. Operating with out all lamps may overdrive lamp current at maximum brightness settings. 2. Verify lamp wiring before connecting lamps to the inverter module. Connecting more than one lamp to one of the four inverter output circuits will result in reduced brightness. The LXM1640-01 module connectors are wired per industry standard. The lamp hot wires (high voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3 or 4. F A I L S A F E F E A T U R E F O R M U L T I P L E L A M P O P E R AT I O N S Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Linfinity "pairs" the lamps so that if one lamp in the pair breaks, most of its current is added to the good lamp. CCFLs will respond with more brightness for a period of time. Operating time in this mode will be a function of the lamps age but should be typically in the order of hundreds of hours. This operating characteristic can provide adequate display performance for a limited, but useful period of time. Shortening of the lamp life in this mode is typically not a concern as it is recommended that all lamps in a display be replaced at the same time.
IS
Lamps
FIGURE 2 -- Quad Output Stage
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Copyright (c) 1998 Rev. 0.4 5/98
PRODUCT DATABOOK 1996/1997
LXM1640-01
DIRECT D R I V E Q U A D LAMP CCFL INVERTER M O D U L E
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DIRECT DRIVE OUTPUT ARCHITECTURE Direct Drive architecture includes two load feedback control loops to provide uncompromised CCFL ignition and operation characteristics. Lamp current is regulated in the CCFL return lead (ISNS loop) to insure constant light output with changing lamp parameters and power supply voltage. This also allows accurate and repeatable brightness control. Dimming ratio with the LX1640 analog dimming inverters is typically 6:1 when driving quad LCD lamp panels. If no current flows in the CCFL return path because of an unstruck or failed lamp, the inverter applies full strike voltage potential. The output voltage feedback loop (VSNS) takes control and regulates output voltage to 1650VRMS. This insures lamps will ignite under worst case temperature and aging conditions. Because output voltage is actively regulated, it will never exceed component and panel insulation ratings. This prevents destructive corona discharge to insure long term reliability of the system.
High Voltage Transformer SLEEP Transformer Driver
VHI1
GND
VSENSE ISENSE VLO
FIGURE 3 -- LXM1640 Block Diagram (Only one lamp shown)
T Y P I C A L A P P L I C AT I O N S
10.8VDC- 13.2VDC 5.0VDC VIN 10k BRITE VHI4 VHI3 VHI2 VHI1
Lamp 1 Lamp 2 Lamp 3 Lamp 4
LXM1640-01
0V 5V SLEEP GND VLO
FIGURE 4 -- Potentiometer Brightness Control
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
Copyright (c) 1998 Rev. 0.4 5/98
LAMP 1
BRITE
Controller
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